BulletSim: btGhostObjects working to make 'volume detect' work.

Rearrangement and cleanup of shape collection code. Much more readable.
Enabling and use of collision filters and masks.
Addition of ID to body creation BulletSimAPI calls so always set in
    shape for collision reporting.
Change default of ShouldSplitSimulationIslands and ShouldRandomizeSolverOrder
    from 'false' to 'true'. When 'false', this suppresses NO_CONTACT_RESPONSE
    which makes volume detect fail.

1 files changed, 10 insertions, 2 deletions

diff --git a/OpenSim/Region/Physics/BulletSPlugin/BSTerrainManager.cs b/OpenSim/Region/Physics/BulletSPlugin/BSTerrainManager.cs
index 093d2a4..5d5d9cb 100755
--- a/OpenSim/Region/Physics/BulletSPlugin/BSTerrainManager.cs
+++ b/OpenSim/Region/Physics/BulletSPlugin/BSTerrainManager.cs
@@ -111,8 +111,12 @@ public class BSTerrainManager
                     BulletSimAPI.CreateGroundPlaneShape2(BSScene.GROUNDPLANE_ID, 1f, TERRAIN_COLLISION_MARGIN),
                     ShapeData.PhysicsShapeType.SHAPE_GROUNDPLANE);
         m_groundPlane = new BulletBody(BSScene.GROUNDPLANE_ID, 
-                        BulletSimAPI.CreateBodyWithDefaultMotionState2(groundPlaneShape.ptr, Vector3.Zero, Quaternion.Identity));
+                        BulletSimAPI.CreateBodyWithDefaultMotionState2(groundPlaneShape.ptr, BSScene.GROUNDPLANE_ID, 
+                                                            Vector3.Zero, Quaternion.Identity));
         BulletSimAPI.AddObjectToWorld2(PhysicsScene.World.ptr, m_groundPlane.ptr);
+        // Everything collides with the ground plane.
+        BulletSimAPI.SetCollisionFilterMask2(m_groundPlane.ptr,
+                        (uint)CollisionFilterGroups.GroundPlaneFilter, (uint)CollisionFilterGroups.GroundPlaneMask);
 
         Vector3 minTerrainCoords = new Vector3(0f, 0f, HEIGHT_INITIALIZATION - HEIGHT_EQUAL_FUDGE);
         Vector3 maxTerrainCoords = new Vector3(DefaultRegionSize.X, DefaultRegionSize.Y, HEIGHT_INITIALIZATION);
@@ -304,7 +308,11 @@ public class BSTerrainManager
 
                     mapInfo.terrainBody = new BulletBody(mapInfo.ID, 
                             BulletSimAPI.CreateBodyWithDefaultMotionState2(mapInfo.terrainShape.ptr, 
-                                            centerPos, Quaternion.Identity)); 
+                                            id, centerPos, Quaternion.Identity)); 
+
+                    BulletSimAPI.SetCollisionFilterMask2(mapInfo.terrainBody.ptr, 
+                                        (uint)CollisionFilterGroups.TerrainFilter,
+                                        (uint)CollisionFilterGroups.TerrainMask);
                 }
 
                 // Make sure the entry is in the heightmap table